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All Journal Jurnal Teknologi Dan Industri Pangan Jurnal Keteknikan Pertanian Mesin Jurnal Otomasi Kontrol dan Instrumentasi
Amoranto Trisnobudi
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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ANALISIS FREKUENSI PADA UJI TAK MERUSAK ULTRASONIK Trisnobudi, Amoranto
Mesin Vol 20, No 2 (2005)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1148.762 KB)

Abstract

In ultrasonic nondestructive testing an ultrasonic wave is usually radiated through a material by a transducer. If there is a flaw inside the material, reflected or diffracted waves caused by the interaction between the ultrasonic wave and the flaw, are received by the same or another transducer. The received signals must be processed in order to obtain information about the flaw characteristics. For the flaw which perpendicular to the beam wave, the flaw size can be determined by amplitude analysis, for example by using DGS (Distance Gain Scale) diagram. The oblique flaw can be characterized by time analysis such as Time of Flight Diffraction (TOFD) method. But if the flaw is small or there is a large enough noise, frequency analysis must be used. This paper deals with the two methods using frequency analysis, i.e. ultrasonic spectroscopy and split spectrum processing, to overcome the above problems.
METODA ULTRASONIK UNTUK MENENTUKAN ARAH KRISTAL TUNGGAL BERSTRUKTUR KUBIK Trisnobudi, Amoranto; Sugiharto, Benny
Mesin Vol 15, No 2 (2000)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (441.843 KB)

Abstract

Single crystal direction can be determined by x-ray diffraction. The determination of this crystal direction can also be carried out by using ultrasonic method. In this method the ultrasonic wave velocity propagating through the crystal is measured. From this velocity measurement then the crystal direction can be determined. This paper deals with the results of a research about the direction determination of cubic single crystal using ultrasonic wave. There are two methods used, namely graphical method and computer method. These two methods used the same data, i.e. velocity data for all possible direction that has been calculated based on the wave and elasticity theory. In the first method, the data are stored as several graphics whereas in the second method they are stored as database in a computer program. These two methods have shown the same results in aluminum for crystal directions [311], [331], [661], [631] and [611] where the computer method can be carried out quicker than the graphical method.
The Measurement of Sucrose Content of Sugar Cane Using Ultrasonic Waves Amoranto Trisnobudi; Tjia Liong Hoei; Enung Rosihan Nugraha
Jurnal Teknologi dan Industri Pangan Vol. 12 No. 1 (2001): Jurnal Teknologi dan Industri Pangan
Publisher : Departemen Ilmu dan Teknologi Pangan, IPB Indonesia bekerjasama dengan PATPI

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Abstract

The measurement of sucrose content of sugar cane is usually carried out by using polarimeter and Brix Wager scale. These two apparatus are operated manually so that the accuracy of the measurement results is depended on the operator skill. To overcome this problem we have developed an alternative method that can measure the sucrose content more quickly and accurately than the conventional methods. This new method was carried out by using ultrasonic waves whose velocity depends on the sucrose content. Firstly, the electronic apparatus used was calibrated with 37 samples of sugar cane with various sucrose content from 4.46 % to 7.29 %. The result of this calibration was an empirical equation between the ultrasonic wave velocity V and the sucrose content R, i.e. R = 2.65 V2 - 11,95 V + 17,65 where R in % and V in km/s. Then this equation was stored as database in a computer program that will be used to calculate the sucrose content. Finally, this sucrose content measurement system was tested by using 30 samples of sugar cane. The maximum error of the measurement result was 6.4 %.
The Influence of Position of Durian in Determination of Ripeness of Durian Non-Destrucyively by Ultrasonic Wave Bambang Haryanto; I Wayan Budiastra; Amoranto Trisnobudi
Jurnal Keteknikan Pertanian Vol. 14 No. 1 (2000): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.014.1.%p

Abstract

The study was conducted to assess the influence of durian 's position toward transmission properties of ultrasonic wave for determination of the fruit ripeness using non-destructiive technique. Three ripe and unripe durian were used to assess transmittance wave that was passed the durian. The measurement was conducted at 3 peak and valley positions and it was repeated 20 times. The result showed that position durian 's inJluenccad thetransmissions of ultrasonic wave. Mo mzJ a (attenuation) values can be used as indicator for durian ripeness. Ripe durian tends to have highera value than unripe durian.
METODA ULTRASONIK UNTUK MENENTUKAN ARAH KRISTAL TUNGGAL BERSTRUKTUR KUBIK Amoranto Trisnobudi; Benny Sugiharto
Mesin Vol. 15 No. 2 (2000)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Single crystal direction can be determined by x-ray diffraction. The determination of this crystal direction can also be carried out by using ultrasonic method. In this method the ultrasonic wave velocity propagating through the crystal is measured. From this velocity measurement then the crystal direction can be determined. This paper deals with the results of a research about the direction determination of cubic single crystal using ultrasonic wave. There are two methods used, namely graphical method and computer method. These two methods used the same data, i.e. velocity data for all possible direction that has been calculated based on the wave and elasticity theory. In the first method, the data are stored as several graphics whereas in the second method they are stored as database in a computer program. These two methods have shown the same results in aluminum for crystal directions [311], [331], [661], [631] and [611] where the computer method can be carried out quicker than the graphical method.
ANALISIS FREKUENSI PADA UJI TAK MERUSAK ULTRASONIK Amoranto Trisnobudi
Mesin Vol. 20 No. 2 (2005)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In ultrasonic nondestructive testing an ultrasonic wave is usually radiated through a material by a transducer. If there is a flaw inside the material, reflected or diffracted waves caused by the interaction between the ultrasonic wave and the flaw, are received by the same or another transducer. The received signals must be processed in order to obtain information about the flaw characteristics. For the flaw which perpendicular to the beam wave, the flaw size can be determined by amplitude analysis, for example by using DGS (Distance Gain Scale) diagram. The oblique flaw can be characterized by time analysis such as Time of Flight Diffraction (TOFD) method. But if the flaw is small or there is a large enough noise, frequency analysis must be used. This paper deals with the two methods using frequency analysis, i.e. ultrasonic spectroscopy and split spectrum processing, to overcome the above problems.
Pengukuran Aliran Udara Dalam Pipa Menggunakan Gelombang Ultrasonik Dengan Metoda Korelasi Silang Deddy Kurniadi; B Suwandhika; Amoranto Trisnobudi
Jurnal Otomasi Kontrol dan Instrumentasi Vol 1 No 1 (2009): Jurnal Otomasi Kontrol dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2009.1.1.5

Abstract

Flowmeter ultrasonik merupakan jenis flowmeter yang memanfaatkan gelombang ultrasonik dalam pengukurannya. Metoda yang umum digunakan adalah metoda waktu tempuh. Metoda ini memiliki prinsip pengukuran yang relatif mudah dibanding dengan metoda lainnya. Namun metoda ini kurang sesuai jika digunakan pada aliran fluida yang tidak laminar. Metoda korelasi silang dengan gelombang ultrasonik dapat digunakan untuk mengukur laju aliran fluida yang relatif bersih tetapi profil aliran yang tidak laminar.Pada makalah ini dibahas suatu studi eksperimen metoda korelasi silang untuk mengukur kecepatan aliran udara dalam suatu pipa. Dari hasil pengukuran dengan metoda waktu tempuh diperoleh kecepatan rata-rata aliran yang berbeda dengan yang diperoleh pada metoda korelasi silang. Hasil pengukuran metoda korelasi silang menunjukkan standar deviasi dan presisi yang relatif tinggi, Hal ini menunjukkan bahwa metoda korelasi silang memberikan hasil yang lebih baik pada kondisi aliran tidak laminar seperti aliran udara dalam pipa. Keywords : gelombang ultrasonik, metoda korelasi silang, waktu tunda, demodulasi, aliran turbulen
Studi Pendahuluan Sistem Tomografi Listrik-Akustik untuk Mendeteksi Kanker Paru-paru K. Ain; Deddy Kurniadi; Amoranto Trisnobudi
Jurnal Otomasi Kontrol dan Instrumentasi Vol 3 No 2 (2011): Jurnal Otomasi Kontrol dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2011.3.2.6

Abstract

Penelitian ini bertujuan untuk mengkaji kemungkinan diterapkannya sistem tomografi listrik-akustik. Sistem tomografi ini dalam bekerjanya menggunakan injeksi pulsa arus listrik sehingga dihasilkan dua data sekaligus, yaitu sinyal akustik dan potensial listrik. Data sinyal akustik memiliki potensi untuk menghasilkan citra resolusi spasial tinggi, sedang data potensial listrik memiliki potensi untuk menghasilkan citra kontras tinggi. Metode yang dilakukan dalam penelitian ini adalah melakukan kajian studi tentang terpenuhinya kemungkinan syarat-syarat yang dibutuhkan. Untuk studi awal ini dilakukan studi simulasi untuk memperoleh data sinyal akustik yang kemudian dilakukan kajian analisis. Hasil dari penelitian ini menunjukkan bahwa sinyal akustik prospektif untuk digunakan dalam deteksi kanker paru karena kontrasnya nilai akustik organ paru dan jaringan kanker paru. 
Simulasi Perambatan Gelombang Ultrasonik dengan Model Berkas Multi Gaussian dan Model Pengukuran Thompson Grey Ni Made D. Ryaumariastini; Deddy Kurniadi; Amoranto Trisnobudi
Jurnal Otomasi Kontrol dan Instrumentasi Vol 4 No 2 (2012): Jurnal Otomasi Kontrol dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2012.4.2.1

Abstract

Transduser ultrasonik adalah komponen untuk pembangkitan gelombang ultrasonik. Dalam aplikasi tertentu, pemilihan transduser yang tepat ditentukan oleh parameter yaitu, frekuensi, diameter, voltage drive, dan jarak  antar transduser. Salah satu cara yang efektif untuk menentukan parameter transduser yang sesuai adalah dengan melakukan simulasi perambatan gelombang ultrasonik yang dihasilkan transduser dengan berbagai variasi parameternya. Pada studi ini dilakukan kajian simulasi perambatan gelombang ultrasonik untuk transduser tercelup berbentuk piston dengan pendekatan model berkas gelombang multi-Gaussian dan model pengukuran Thompson-Gray. Simulasi menggunakan perangkat lunak yang dibuat berupa graphical user interface. Parameter-parameter transduser divariasikan untuk pengamatan pada berbagai kondisi. Hasil kajian simulasi divalidasi dengan hasil pengukuran eksperimen perambatan gelombang ultrasonik dari transduser tercelup berbentuk piston. Dari kajian, diperoleh perbedaan antara hasil simulasi dan eksperimen adalah 3.55% untuk nilai selisih tegangan keluaran dan 0.17% untuk nilai selisih waktu tempuh.
Co-Authors B Suwandhika Bambang Haryanto Benny Sugiharto Deddy Kurniadi Enung Rosihan Nugraha I Wayan Budiastra K. Ain Ni Made D. Ryaumariastini Sugiharto, Benny Tjia Liong Hoei